The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper an analytical approach is presented to determine the impact of frequency offset, timing jitter and additive white Gaussian noise (AWGN) on the bit error rate (BER) performance of a multi-carrier direct-sequence code division multiple access (MC-DS-CDMA) system over a Rayleigh Fading Channel. The analysis developed the pdf (probability density function) at the receiver considering combined...
The effectiveness of different diversity combining techniques in improving the bit error rate (BER) performance of a direct-sequence code-division multiple-access (DS-CDMA) system is presented in this paper. The overall performance of a DS-CDMA system is degraded by multipath fading and additive white Gaussian noise (AWGN). To evaluate the degradation, the expression for the conditional BER, conditioned...
The effects of multipath fading and additive white Gaussian noise (AWGN) on the bit error rate (BER) performance of direct-sequence code-division multiple-access (DS-CDMA) systems is studied in this paper. The expression for the conditional BER, conditioned on a given level of fading is derived and then the unconditional BER is evaluated. The BER performance results of the system are evaluated in...
The fractional Fourier transform (FRFT) is one among the most efficient techniques for digital signal processing of linear frequency modulated (LFM) signal applications. Chirp (or LFM) modulation spread spectrum (CMSS) with FRFT technique is employed for demodulation of the multiple access System. The concept of multiple access is based on the use of multiple chirp signals, with different chirp rate,...
In this paper, we present the impact of timing jitter on a direct sequence ultra wideband (DS-UWB) system in additive white Gaussian noise (AWGN) and multipath environment. Rake receiver is used to capture the multipath profile. Investigation is performed in ordinary and optimum Rake, each with all Rake (ARake) and selective Rake (SRake). Additionally, the equal gain combining (EGC) maximal ratio...
System capacity of noncoherent synchronous hybrid direct sequence (DS) slow frequency hopping (SFH) multiple access communication system is examined. System operates through the channel with additive white Gaussian noise (AWGN) and employs differential phase shift keying modulation (DPSK). System capacity is analyzed for random signature sequence and frequency hopping pattern, impact of DS code length,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.